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Interleukin-3 withdrawal induces an early increase in mitochondrial membrane potential unrelated to the Bcl-2 fammily - Roles of intracellular pH, ADP transport, and F0F1-ATPase

  1. Author:
    Khaled, A. R.
    Reynolds, D. A.
    Young, H. A.
    Thompson, C. B.
    Muegge, K.
    Durum, S. K.

  2. Author Address

    NCI, Sect Cytokines & Immun, Mol Immunoregulat Lab, Div Basic Sci, NIH, Bldg 560, Rm 31-71, Frederick, MD 21702 USA. NCI, Sect Cytokines & Immun, Mol Immunoregulat Lab, Div Basic Sci, NIH, Frederick, MD 21702 USA. NCI, Expt Immunol Lab, Div Basic Sci, NIH, Frederick, MD 21702 USA. Sci Applicat Int Corp, Frederick, MD 21702 USA. Univ Penn, Philadelphia, PA 19104 USA. Durum SK NCI, Sect Cytokines & Immun, Mol Immunoregulat Lab, Div Basic Sci, NIH, Bldg 560, Rm 31-71, Frederick, MD 21702 USA.
    1. Year: 2001
  2. Journal: Journal of Biological Chemistry
    1. 276
    2. 9
    3. Pages: 6453-6462
  4. Type of Article: Article
  1. Abstract:

    Cytokines such as interleukin-3 (IL-3) promote the survival of hematopoietic cells through mechanisms that are not well characterized. Withdrawal of IL-3 from an IL-3-dependent pro-B cell line induced early stress-related events that preceded cell death by more than 40 h. Intracellular pH rose above pH 7.8, peaking 2-3 h post-IL-3 withdrawal, and induced a transient increase in mitochondrial membrane potential (Delta psi (m)) detected using several different dyes. Similar events were observed following IL-7 withdrawal from a different dependent cell line. Bcl-2, Bax, and caspases were unrelated to these early events. Intracellular alkaline pH inhibited the mitochondrial import of ADP, which would limit ATP synthesis. Total cellular ATP sharply declined during this early period, presumably as a consequence of suppressed ADP import. This was followed by an increase in reduced pyridine nucleotides. The transient increase in Delta psi (m) was blocked by oligomycin, an inhibitor of F0F1. ATPase that may have undergone reversal caused by the abnormal ADP-ATP balance within mitochondria. These findings suggest a novel sequence of early events following trophic factor withdrawal in which alkaline pH inhibits ADP import into mitochondria, reversing the F0F1. ATPase, which in turn consumes ATP and pumps out protons, raising Delta psi (m).

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